linux-kernel - RE: [PATCH 01/12] bus: ti-sysc: Support 16-bit writes too

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Date:   Tue, 28 May 2019 11:06:26 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Tony Lindgren' <tony@...mide.com>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
CC:     Dave Gerlach <d-gerlach@...com>, Faiz Abbas <faiz_abbas@...com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Keerthy <j-keerthy@...com>, Nishanth Menon <nm@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        "Roger Quadros" <rogerq@...com>, Suman Anna <s-anna@...com>,
        Tero Kristo <t-kristo@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH 01/12] bus: ti-sysc: Support 16-bit writes too

From: Tony Lindgren
> Sent: 27 May 2019 13:14
> We need to also support 16-bit writes for i2c in addition to the reads
> when we start configuring the sysconfig register for reset and idle modes.
> 
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
>  drivers/bus/ti-sysc.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
> --- a/drivers/bus/ti-sysc.c
> +++ b/drivers/bus/ti-sysc.c
> @@ -100,6 +100,13 @@ static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
> 
>  static void sysc_write(struct sysc *ddata, int offset, u32 value)
>  {
> +	if (ddata->cfg.quirks & SYSC_QUIRK_16BIT) {
> +		writew_relaxed(value & 0xffff, ddata->module_va + offset);
> +		writew_relaxed(value >> 16, ddata->module_va + offset + 4);

Should that be + 2 ???

> +
> +		return;
> +	}
> +
>  	writel_relaxed(value, ddata->module_va + offset);
>  }

	David

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